68
68 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 2
- Digit sum
- 14
- Digital root
- 5
- Palindrome
- No
- Divisor count
- 6
- σ(n) — sum of divisors
- 126
Primality
Prime factorization: 2 2 × 17
Divisors & multiples
Representations
- In words
- sixty-eight
- Ordinal
- 68th
- Roman numeral
- LXVIII
- Binary
- 1000100
- Octal
- 104
- Hexadecimal
- 44
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 68, here are decompositions:
- 7 + 61 = 68
- 31 + 37 = 68
As an ASCII codepoint, 68 is D. Printable ASCII character D.
TCP/UDP port 68 is the well-known port for DHCP client — Dynamic Host Configuration Protocol — client.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.68.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.